GAME THEORETIC APPROACH FOR MULTIUSER DETECTION AND POWER CONTROL FOR CDMA SYSTEMS

Increasing demand of real-time multimedia communication motivates to develop an efficient system to provide better quality of service for end user. Recently, cellular communication system has grown drastically and still increasing. For this type of communication systems, CDMA (Code-Division Multiple Access) technique is considered as most promising as satisfying technique to meet the end-user requirement for real-time communication. However, during communication, original signal gets affected or contaminated due to channel interference or near-far effect in CDMA system which can degrade communication performance. This issue can be addressed by using multiuser detection techniques. However, various techniques have been introduced but still it remains a challenging task due to computational complexity. Similarly, power consumption during communication is also a challenging task in these researches. In this work, multiuser user detection and power controlling issues of CDMA systems are addressed using Game theoretic approach using non-cooperative game theory. Proposed approach aims on the maximization of utility functions by considering more number of users in the network. Proposed technique obtains relationship between utility maximization and data sequence vector which helps to find an optimal solution. Furthermore, technique uses Nash Equilibrium scenario for iterative power adjustment using multiuser system efficiency. An extensive simulation study is carried out which shows that proposed approach can be used for multiuser detection and power control strategy in CDMA systems